EP0122354A2 - Central téléphonique - Google Patents

Central téléphonique Download PDF

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Publication number
EP0122354A2
EP0122354A2 EP83730092A EP83730092A EP0122354A2 EP 0122354 A2 EP0122354 A2 EP 0122354A2 EP 83730092 A EP83730092 A EP 83730092A EP 83730092 A EP83730092 A EP 83730092A EP 0122354 A2 EP0122354 A2 EP 0122354A2
Authority
EP
European Patent Office
Prior art keywords
call
transfer
transferring
extension
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83730092A
Other languages
German (de)
English (en)
Other versions
EP0122354A3 (fr
Inventor
Peter Schmidt
Kurt Sommer
Wolfgang Dr. Perlich
Siegfried Wegner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elmeg Kommunikationstechnik GmbH
Original Assignee
Elmeg Kommunikationstechnik GmbH
ELMEG Elektro Mechanik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elmeg Kommunikationstechnik GmbH, ELMEG Elektro Mechanik GmbH filed Critical Elmeg Kommunikationstechnik GmbH
Publication of EP0122354A2 publication Critical patent/EP0122354A2/fr
Publication of EP0122354A3 publication Critical patent/EP0122354A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements
    • H04M1/715—Substation extension arrangements using two or more extensions per line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Definitions

  • the invention relates to a telephone switching system of the type specified in the preamble of claim 1.
  • the existing station is directly dialed by dialing a number as a coded function control to the station to which the outside call is to be transferred, with the selected subscriber after picking up the handset the relevant outside call is immediately available.
  • transferring is possible very quickly and the charge times for the trunk are only slightly extended by the transfer process. There is no need to operate an additional control element, such as the earth button.
  • the invention specified in claim 1 is therefore based on the object of specifying a switching system of the type mentioned, in which the termination of a transfer attempt when the call station is unsuccessfully called for the purpose of delivering a corresponding message to the other subscriber or to continue the conversation without manu All actuation of a switching element can take place from the apparatus from which the transfer was initiated.
  • the invention is based on the recognition that it is precisely small V determination systems, which are fed from the outside line, usually used to the distances of persons within an office or household to reduce each the next phone, so that unnecessary travel times are reduced . This also reduces the time it takes for a call to go off-hook. As a result, an internal transfer process generally only requires a relatively short period of time before the call is answered. The trunk line can then be automatically returned. Thus is connected to the invention, a substantial simplify operation, since it is not necessary for an unsuccessful assignment test - as before - to operate an additional actuator to recover an outside line so that the calling or taught at g ecurie participants of the failed attempt at mediation can . In addition, there is of course the advantage mentioned at the outset that no special power supply unit is required for the power supply of the private branch exchange.
  • the time limit of the call times also helps to reduce the times of the trunks that are subject to charges and also to reduce the number of seizures of trunks overall despite the transfer. This is particularly advantageous from the point of view that international calls are increasingly being conducted today, which may incur significant fees during the transfer periods.
  • a short warning tone is transmitted to the transferring subscriber when the call ends during the transfer attempt and the switch back to the outside line, so that he is informed about the unsuccessful end of the transfer attempt and at the same time is prompted to speak to the subscriber connected via the outside line is.
  • This attention tone differs from the acoustic signal which is emitted when the subscriber to whom the call was made has taken over the outside call. In the latter case there is no white more activity of the transferring participant is required. Any signal can expediently be dispensed with and the confirmation of the successful transfer occurs only in that the ringing tone transmitted to the transferring subscriber ends and, if appropriate, the busy tone is transmitted instead.
  • This development is therefore based on the task of improving the time-optimized direct transfer in such a way that the time-consuming work of the transferring subscriber is reduced.
  • This happens because the transferring subscriber is no longer claimed in the attention of the subscriber to whom the call is to be transferred for the duration of the call time, but only in the event that the transfer attempt was unsuccessful, the return of the Outside call signaled. It is therefore no longer necessary to monitor the signals in the earpiece, but the attention is only re-used in the event of an unsuccessful transfer by a renewed call signaling.
  • the measures according to the development of the invention make an extraordinary contribution to simplifying the operation, since the transfer can now be carried out without special attention in a single operation, which, for example, does not significantly impair the transferring participant in his concentration in the present work.
  • Voice commands determine whether the subscriber to which the A is to be transferred mtshunt has decreased or not. As another activity at the transferring subscriber only necessary optionally, if the called party does not answer, the tracking of the H does not örsignale in most cases to an action at the transferring subscriber.
  • This embodiment of the invention also offers the advantage that it is also possible to use telephones which are equipped with active circuits which transmit audio signals only when they are supplied with larger currents which cannot be achieved with a switching device fed from the outside line.
  • the transferring subscriber can not only determine the extension to be called by dialing a single digit, but instead enter a sequence of digits, the extensions being called one after the other for a fixed period of time.
  • an extended call can be triggered one after the other by repeatedly dialing a number assigned to the same extension.
  • the transferring station is not automatically called back in the event of an unsuccessful transfer, but only in the case when the digit of the own station was last entered within the programmed sequence of digits.
  • the transferring participant can decide whether or not to call again if the transfer attempt is unsuccessful. In the latter case, he would have informed the subscriber calling via the outside line in advance that if the desired subscriber does not answer the call, the connection is automatically released, the subscriber calling via the outside line possibly transmitting a corresponding signal, such as the "busy" sign can be.
  • the successively entered digits are recorded in a shift register, while in the case of an embodiment with a microprocessor, the corresponding data are stored in registers to be processed in succession.
  • the chain of calls is interrupted and the transfer process is ended when one of the called stations is picked up.
  • the functions of transmitting audible signals to the transferring station and calling back if the transfer attempt is unsuccessful can also be combined in a circuit, in which case the transferring apparatus must be monitored to determine whether the loop is interrupted if the transfer attempt is unsuccessful. In this case, a call would go to the moving apparatus.
  • FIG. 1 shows a block diagram of a first exemplary embodiment of the private branch exchange according to the invention.
  • FIG. 1 shows a block diagram of a first exemplary embodiment of the private branch exchange according to the invention.
  • switching means were not taken into account, which form a safeguard against incorrect operation or inadmissible operation, since this would have reduced the clarity.
  • three Ibis 3 extension sets can optionally be connected to the trunk line 4 for making a telephone call , whereby no voice connection is possible between the extension sets 1 to 3.
  • incoming or outgoing external calls can be transferred to another connected set.
  • the entire functional sequence is expediently controlled by means of a microprocessor (block 5), the function of which is not shown in detail.
  • the program of the microprocessor controls the functional elements shown in the sequence described, or generates the relevant logical functions or links within the Program flow.
  • the microprocessor 5 is fed by means of a power supply part 6 - which is also only shown schematically - from the exchange line 4, the power consumption of the microprocessor when it is manufactured in CMOS technology can be neglected almost.
  • the ringing signal passes via the switching elements 7, 8 and 9, which have R uhechante, and other switches 10, 11 and 12 respectively for the apparatuses 1, 2 and 3 respectively.
  • the other AND gates 20, 21 shown and the OR gates 22, 23 and 24 work in a corresponding manner with regard to. on apparatuses 2 and 3 and assign the trunk line to the first set picked up. The same switching state occurs if an outgoing outside call is made without an incoming call and an outside line number was initially issued.
  • a reallocation process can be initiated by actuating the dialing process of the set connected to the trunk line.
  • the dialing signals issued by the apparatus connected to the outside line arrive at a dialing signal decoder 25 which is preferably matched to the pulse dialing method .
  • a timer 26 designed as a monoflop is also provided, which limits the delivery of dialing characters to a predetermined time period. This delivery is limited to a period of approximately ten seconds after the last dialing signal has been issued after the first loop detection, which was not caused by a flipping process (output signals of the AND gates 16, 20 or 21).
  • the output signals mentioned arrive at an OR gate 27, by means of the output signal of which the said timer 26 is set for the period during which no signals are fed to the dialing character decoder 25, which is effected by means of an AND gate 28 which receives the output signal of the timer 26 is fed to an inverting input.
  • the output signal of the OR gate 27 is further passed through an additional AND gate 29, at whose further inverting input the output signal of a detection circuit 30 for incoming exchange calls is present, so that the activation of the timer 26 does not take place in the case when a loop detection is on an incoming outside call was made. In this way it is ensured that a dialing signal given after an incoming call triggers a transfer process without further notice.
  • the dialing character information output by the dialing character decoder 25 passes from the output of the AND gate 28 to an evaluation circuit 29a which, depending on the dialing character information, initiates a calling process on the apparatus to which the call is to be made.
  • a switching element flip-flop 31, 32 or 33
  • a switching element flip-flop 31, 32 or 33 associated therewith is set in the apparatus from which the flipping process is initiated, so that the flipping state is recorded for this apparatus.
  • the corresponding logical selection is made via OR gates 34, 35 and 36 with the respectively assigned AND gates 37, 38 and 39.
  • the flip-flop 31, 32 and 33 belonging to the moving apparatus is set via the aforementioned gates, when a transfer signal for one of the other two devices has been detected (OR gate 34, 35 or 36) and at the same time the loop detection of the switching device outputs an output signal (linkage via AND gate 37, 38 or 39).
  • the switching element 10 is actuated, so that the moving apparatus from the office device is separated and connected to a line which feeds this the call signal.
  • the exchange line is connected by means of a switch 41 to a hold circuit 42, which is used for the exchange line to maintain the busy state forms necessary resistance.
  • This resistance is implemented, for example, by a circuit for the simultaneous power supply of a call current circuit, as described in German patent application P 32 44 194.2 by the same applicant.
  • the output signal of the holding circuit 42 controls the generation of the call current and the acoustic identification signals for the transferring extension by means of a signal circuit 43.
  • the call current is therefore only present at the corresponding output during the transfer process (output signal of the OR gate 40).
  • the apparatus to which a transfer is to be made is addressed by the circuit 29a.
  • a flip-flop 44, 45 or 46 assigned to this apparatus is set.
  • one of the flip-flops 45 and 46 is thus set.
  • the set flip-flop activates one of the assigned switches 47, 48 or 49, which connects the apparatus to be transferred to the output signal of the signal circuit 43, so that the internal call is signaled to the apparatus concerned.
  • a corresponding acoustic signal is also from the Circuit 43 issued and fed to the switching apparatus via the respectively assigned changeover switch 10, 11 or 12. While the call is going out, the so-called "dial tone" is usually given.
  • the number of call signals emitted (counter 50) or (alternatively) the time of the transfer (dashed time measuring circuit 51) is now monitored.
  • the counter 50 thus outputs an output signal if a predetermined number of calls (preferably three or four) have been made after the transfer, while the time measuring circuit 51 outputs an output signal if the transfer process has lasted a predetermined time without being removed from the other subscriber has been.
  • the transfer is terminated as unsuccessful and all flip-flops 31 to 33 and 44 to 46 are reset via a corresponding OR gate 52 and the respective reset inputs of the flip-flops mentioned.
  • a pulse is emitted to the signal circuit, which then emits an additional, concise, short identification signal, which signals the transferring subscriber that the call has not been accepted and that he is again connected to the caller on the outside line.
  • a corresponding acoustic identifier could also consist in the simple termination of the output of the free sign, however, the transferring subscriber would have to let a certain period of time pass in order to reliably recognize the changed operating state. If the called subscriber accepts the call, the "free" sign changes to the "busy” sign.
  • the switching elements in question are caused to be reset from the transferred state, delayed by a delay element 53.
  • the transferring subscriber receives the exchange connection back and can inform the calling or called subscriber that the transfer attempt has failed.
  • the automatic termination of the call will take place after a relatively short time (a few seconds or a few ring signals), since - as mentioned at the beginning - it can be assumed that if a plurality of telephone sets assigned to an outside line are present, the desired person will be at a relatively short distance the device to which the call is to be transferred.
  • the automated downshifting according to the invention thus saves the necessary handling for ending the call state, which is associated with a simplification, since it can be expected that the majority of the call states are of shorter duration.
  • An additional manual operation is only necessary in the event that a longer call is to be made as an exception. This results in the additional advantage that the waiting subscriber connected via the exchange line now receives an oral message after a predetermined maximum time, since this if the transfer process, contrary to expectations, takes a long time and remains without a message, possibly hanging up disappointed in the meantime.
  • the switching means are designed in such a way that the flip-flops which characterize the "transfer target" are only reset by means of a corresponding link via logic gates if the transfer is unsuccessful if the exchange connection is also interrupted. So should the called subscriber be can only be reached shortly after the end of the call process, then in this case, picking up the handset of the previously called set either either immediately transfers the call, or the subscriber of the private branch exchange connected to the outside line is identified by a corresponding tone signal. that a new attempt to reallocate will be successful.
  • a signal at an output A of the shift register indicates that the transfer status has been initiated and a call signal is now being output to an addressed apparatus.
  • the signal at the output A separates the switching apparatus from the exchange line via OR gates 18, 19 and 24 and connects this to the hold circuit 42 via a switch 41 - as previously illustrated.
  • the call current generator circuit 43 also emits call signals, the duration of which the counter 50 or the time measuring circuit 51 is monitored.
  • the output signal of the shift register 61 which contains the information of the stored digits in the original order, passes to an address decoder 62, through which - depending on the digit output - one of the devices 1, 2 or 3 via the switches 47, 48 or 49 with the Call stream as the output signal of the.
  • Circuit 43 is connected.
  • the shift register 61 is clocked at data readout by the output of the circuits 50 or 51 so that signals the end of the predetermined time period or the predetermined number of R UF corresponding to the next digit entered station is called.
  • a delay generating circuit 63 shortly appearing signal generated, which resets the counter 50 and the time measuring circuit 51 via its reset input in an initial state.
  • Via the inverting input of an OR gate 64 the circuits 50 and 51 are kept reset even if there is no digit in the shift register 61, that is to say the transfer state has ended.
  • the hold circuit drops off without further ado, and if necessary a corresponding acoustic identification signal - such as the "busy" sign - can still be transmitted to the subscriber calling via the outside line, so that the operator hangs up.
  • a corresponding acoustic identification signal - such as the "busy" sign - can still be transmitted to the subscriber calling via the outside line, so that the operator hangs up.
  • the number of the own station is programmed again as the last digit in shift register 61, so that a corresponding announcement can be transmitted to the subscriber calling via the outside line .
  • the embodiment of a switching system according to the invention thus enables a large number of variants which ensure simple operability. Even if the various features are provided at the same time, they remain clear for the operator and are understood without a long explanation, so that easy handling is ensured in any case.
  • the function control of such a telephone switching system is preferably programmable using a microprocessor.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
EP83730092A 1983-04-13 1983-09-29 Central téléphonique Withdrawn EP0122354A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3313775 1983-04-13
DE3313775 1983-04-13
DE19833325435 DE3325435A1 (de) 1983-04-13 1983-07-12 Fernsprechnebenstellenanlage
DE3325435 1983-07-12

Publications (2)

Publication Number Publication Date
EP0122354A2 true EP0122354A2 (fr) 1984-10-24
EP0122354A3 EP0122354A3 (fr) 1986-04-23

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Family Applications (1)

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EP83730092A Withdrawn EP0122354A3 (fr) 1983-04-13 1983-09-29 Central téléphonique

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EP (1) EP0122354A3 (fr)
DE (1) DE3325435A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0293876A2 (fr) * 1987-06-04 1988-12-07 Siemens Aktiengesellschaft Méthode pour un central privé à deux lignes extérieures comprenant un poste téléphonique principal et plusieurs postes téléphoniques secondaires
EP0293875A2 (fr) * 1987-06-04 1988-12-07 Siemens Aktiengesellschaft Méthode pour un central privé à deux lignes extérieures comprenant un poste téléphonique principal et plusieurs postes téléphoniques secondaires
GB2249694A (en) * 1990-08-27 1992-05-13 Panduit Corp Pbx inward dialling system
US5953401A (en) * 1988-07-15 1999-09-14 Panduit Corp. Transparent caller interactive attendant bypass system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3732823A1 (de) * 1987-09-29 1989-04-06 Siemens Ag Verfahren fuer ein modular strukturiertes digitales kommunikationssystem mit einer anzahl von unterschiedlichen endgeraeten

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2255763A1 (fr) * 1973-12-20 1975-07-18 Siemens Ag
DE3106206A1 (de) * 1981-02-16 1982-09-09 Elmeg Elektro-Mechanik Gmbh, 3150 Peine "fernsprechnebenstellenanlage"

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2255763A1 (fr) * 1973-12-20 1975-07-18 Siemens Ag
DE3106206A1 (de) * 1981-02-16 1982-09-09 Elmeg Elektro-Mechanik Gmbh, 3150 Peine "fernsprechnebenstellenanlage"

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0293876A2 (fr) * 1987-06-04 1988-12-07 Siemens Aktiengesellschaft Méthode pour un central privé à deux lignes extérieures comprenant un poste téléphonique principal et plusieurs postes téléphoniques secondaires
EP0293875A2 (fr) * 1987-06-04 1988-12-07 Siemens Aktiengesellschaft Méthode pour un central privé à deux lignes extérieures comprenant un poste téléphonique principal et plusieurs postes téléphoniques secondaires
EP0293875A3 (en) * 1987-06-04 1989-07-05 Siemens Aktiengesellschaft Berlin Und Munchen Method for a private branch exchange with two trunk lines comprising a main telephone set and a plurality of extension telephone sets
EP0293876A3 (fr) * 1987-06-04 1991-01-30 Siemens Aktiengesellschaft Méthode pour un central privé à deux lignes extérieures comprenant un poste téléphonique principal et plusieurs postes téléphoniques secondaires
US5953401A (en) * 1988-07-15 1999-09-14 Panduit Corp. Transparent caller interactive attendant bypass system
GB2249694A (en) * 1990-08-27 1992-05-13 Panduit Corp Pbx inward dialling system
GB2249694B (en) * 1990-08-27 1994-09-21 Panduit Corp Transparent caller interactive attendant bypass system

Also Published As

Publication number Publication date
EP0122354A3 (fr) 1986-04-23
DE3325435A1 (de) 1984-10-18

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